The high pressure power steering hose will commonly leak fluid; it should be replaced.
Problems for specific Pontiac Grand Prix years:
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Most reported 1991 Pontiac Grand Prix problems
The fuel pump may fail causing engine to stall and not restart.
The upper intake manifold gasket and/or a PCV vacuum lines/hoses can develop vacuum leaks with age. This type of leak can result in a higher that normal or rough idle.
The rubber section of an automatic transmission cooler line may develop a fluid leak . In some cases the leaking section of hose can be replaced. In others, the complete cooler line must be replaced to correct this concern.
An engine oil leak may develop from the oil pump drive O-ring. This can often be confused with an intake manifold gasket leak. Careful inspection is required to determine the exact cause of the leak. Replacement of the failed 0-ring will commonly correct this concern.
Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.
The engine temperature sensor wire for the engine temperature gauge, or warning light, may touch the rear exhaust manifold causing a short to ground causing erratic operation of the temperature gauge or warning light.